Cover the base of a large baking dish (9" x 11" - inches) with about 2 to 3 cups of the tomato sauce. The layer of sauce should be about ½" - inch high.
Place the pieces of chicken into the sauce, shuffling them around a bit if needed to lay somewhat flat.
Next, spoon a couple of tablespoons of the sauce onto each piece, followed by a bit of grated cheese.
Bake for about 10-15 minutes or until cooked and heated through. If desired, you can turn on the broiler for the last 2-3 minutes of cooking to slightly brown the cheese.